CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 137,664	$ 123,330	$ 111,332
Other comprehensive earnings/(loss), net of tax
Pension and other postretirement benefit plans	(25,575)	28,102	(9,533)
Foreign currency translation adjustments	(8,142)	(2,906)	656
Other comprehensive earnings/(loss)	(33,717)	25,196	(8,877)
Comprehensive earnings	$ 103,947us-gaap_ComprehensiveIncomeNetOfTax	$ 148,526us-gaap_ComprehensiveIncomeNetOfTax	$ 102,455us-gaap_ComprehensiveIncomeNetOfTax

Other Comprehensive Income Minimum Pensions Liability Net Adjustment Net of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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